Kirchhoff-EQ: looking for the ultimate EQ for my mixing

Hi everyone! I'm looking for the ultimate EQ for my mixing.
Does anyone have any feedback on this one?

To be honest, the "keyboard" is what caught my attention,
but it looks interesting in many aspects.

Seems mindblowing to me but... Has anyone here used it?

Frequency response of analogue prototype (blue) and common digital filters (red).

Frequency response of analogue prototype (blue) and Kirchhoff-EQ (red).